Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fff3f7fb427bed…

MALICIOUS

PDF

48.7 KB Created: 2020-09-02 15:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4943cbc43ec5a0ddc2722d0e39f5a8 SHA-1: 86209142867d0f9fc11e516c36de4db9e5b690fb SHA-256: 44fff3f7fb427bed4d9b5a0b39f2d8b15d6cf9201875a721d49145f8d0b599d3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link. The embedded document body text, though heavily obfuscated, includes the URL 'https://ttraff.me/wix?keyword=electrons+in+atoms+chapter+5+study+guide', which is also listed as an unknown URL. This URL is the primary indicator of malicious activity, likely serving as a lure to a phishing site or malware download. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/wix?keyword=electrons+in+atoms+chapter+5+study+guide
    • https://static.usrfiles.com/ugd/b8c837_6696f1346f22413383b16c2a7a2f1f91.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_af1ecabe651b4574b6e1956922ec01c0.pdf
    • https://static.usrfiles.com/ugd/69b86f_18ceb39be45b4515b71fdbdebaf0b72b.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/75797564991.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/75134692091.pdf
    • https://cdn.shopify.com/s/files/1/0465/0221/5838/files/27527469779.pdf
    • https://cdn.shopify.com/s/files/1/0433/5271/9515/files/minion_rush_game_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/aspect_ewfm_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/19780625191.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/chemical_equilibrium_class_11_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/av_script_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/15396142995.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/fetodusivebetibode.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/dusigozutaguvisof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007684.bin
d7872f2f28a982f8849462c15dffb34423f95cca091ee16e411f39f53a71e7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7684 1596 bytes
font_01_sfnt_off00007e80.bin
a8815bf551b3d4f99b0dc7c82524a3f9568c42393e6dbd64a4bca258cbe60f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E80 5672 bytes
font_02_sfnt_off000091a9.bin
91401792e7eafb63d811be9fe42434d633318cd0fc36dd3fe9babf40c64abd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A9 10732 bytes

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